A quick introduction to ‘rubber’

Rubber is a molecule that is found naturally in some plants (Havea brasiliensis) or can be manufactured synthetically from petroleum. The name rubber was coined by the English chemist Joseph Priestley in 1770 when he found it could be used to rub out pencil marks. The chemical structure of rubber comprises essentially of one type of molecule that is replicated several times (polymer) and connected together in the form of a chain.

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How many times do our ribs move while we breathe?

Humans have a set of 24 ribs, 12 on each side, which surrounds the chest and enables breathing. Ribs protect the heart and the lungs. The lungs inflate during breathing and the ribs move to accommodate the inflated lungs. This movement happens about five million times a year, corresponding to the number of times we breathe in a year.

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What is the fear of peanut butter sticking to the roof of the mouth called?

The word ‘arachibutyrophobia’ is derived from arachis, meaning peanuts. The full meaning of the word is fear of peanut oil sticking to the roof of the mouth. Arachis is a kind of oil found in many nuts and peanuts which stick to the roof of the mouth. In many cases, the saliva fails to dissolve this. A person is not able to extract the sticky thing, and thus faces embarrassment, especially in public places, and develops a fear of it.

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Tooth regeneration in crocodiles

Crocodiles have 24 sharp teeth on each jaw, which are meant to grasp and crush, not  to  chew.  The  teeth are continuously replaced during a crocodile’s lifetime. Each tooth is hollow, and a new tooth grows inside the old one in order to be ready once the old tooth is lost. Young crocodiles can replace their teeth at a rate of one new tooth per socket each month.

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Origin of the River Narmada

The origin of the Narmada River is Narmada Kund, which is situated on the Amarkantak Hill in Anuppur District of East Madhya Pradesh. The river flows east to west, which is opposite to the direction of  rotation of the earth, over a length of 1,312 km before draining down the Gulf of Cambay (Khambat) into the Arabian Sea. It is the only rain-fed river in India that flows in a rift valley. The other two rain-fed rivers that flow from east to west are the Tapti and Mahi.

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